{"id":17302,"date":"2022-06-27T13:06:46","date_gmt":"2022-06-27T13:06:46","guid":{"rendered":"https:\/\/zecovalve.com\/?p=17302"},"modified":"2022-09-07T01:31:44","modified_gmt":"2022-09-07T01:31:44","slug":"a-brief-introduction-to-the-advantages-of-underground-gate-valve","status":"publish","type":"post","link":"https:\/\/zecovalve.com\/pt\/a-brief-introduction-to-the-advantages-of-underground-gate-valve.html","title":{"rendered":"Uma breve introdu\u00e7\u00e3o \u00e0s vantagens da v\u00e1lvula de gaveta subterr\u00e2nea"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-the-underground-gate-valve-has-the-following-advantages\">A v\u00e1lvula de gaveta subterr\u00e2nea tem as seguintes vantagens:<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>1. pequena resist\u00eancia ao fluxo. A passagem do meio no interior do corpo da v\u00e1lvula \u00e9 direta, o meio flui em linha reta e a resist\u00eancia ao fluxo \u00e9 pequena.<\/li><li>2. \u00e9 mais econ\u00f3mica na abertura e no fecho. Em compara\u00e7\u00e3o com as v\u00e1lvulas de globo, a comporta move-se numa dire\u00e7\u00e3o perpendicular \u00e0 dire\u00e7\u00e3o do fluxo do fluido, quer esteja aberta ou fechada.<\/li><li>3. alta altitude, longo tempo de abertura e fecho. O curso de abertura e fecho do port\u00e3o \u00e9 grande, e a descida \u00e9 efectuada por parafuso.<\/li><li>4. O golpe de ar\u00edete n\u00e3o \u00e9 f\u00e1cil de ocorrer. A raz\u00e3o \u00e9 o longo tempo de fecho.<\/li><li>5. O meio pode fluir em qualquer dire\u00e7\u00e3o em ambos os lados e \u00e9 f\u00e1cil de instalar. Ambos os lados da passagem da v\u00e1lvula de gaveta s\u00e3o sim\u00e9tricos.<\/li><li>6. O comprimento da estrutura (a dist\u00e2ncia entre as duas extremidades de liga\u00e7\u00e3o do casco de amarra\u00e7\u00e3o) \u00e9 pequeno.<\/li><li>7. A superf\u00edcie de veda\u00e7\u00e3o \u00e9 f\u00e1cil de desgastar e rasgar, o que afecta a vida \u00fatil. Ao abrir e fechar, as duas superf\u00edcies de veda\u00e7\u00e3o da porta e da sede da v\u00e1lvula deslizam e friccionam uma com a outra. \u00c9 f\u00e1cil causar abras\u00e3o e desgaste sob press\u00e3o m\u00e9dia, o que afecta o desempenho da veda\u00e7\u00e3o e encurta a vida \u00fatil.<\/li><li>8. O pre\u00e7o \u00e9 mais caro. H\u00e1 muitas superf\u00edcies de veda\u00e7\u00e3o de contacto e o processamento \u00e9 mais complicado, especialmente a superf\u00edcie de veda\u00e7\u00e3o no assento do port\u00e3o n\u00e3o \u00e9 f\u00e1cil de processar, e h\u00e1 muitas pe\u00e7as.<\/li><li>9. Forma simples, comprimento curto, boa tecnologia de fabrico e vasta aplica\u00e7\u00e3o.<\/li><li>10. Estrutura compacta, boa rigidez da v\u00e1lvula, passagem suave, pequena resist\u00eancia ao fluxo, superf\u00edcie de veda\u00e7\u00e3o em a\u00e7o inoxid\u00e1vel e carboneto cimentado, longa vida \u00fatil, embalagem em PTFE, veda\u00e7\u00e3o fi\u00e1vel, funcionamento f\u00e1cil e flex\u00edvel.<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>A v\u00e1lvula de gaveta subterr\u00e2nea tem as seguintes vantagens: 1. pequena resist\u00eancia ao fluxo. A passagem do meio no interior do corpo da v\u00e1lvula \u00e9 direta, a ... <a title=\"Uma breve introdu\u00e7\u00e3o \u00e0s vantagens da v\u00e1lvula de gaveta subterr\u00e2nea\" class=\"read-more\" href=\"https:\/\/zecovalve.com\/pt\/a-brief-introduction-to-the-advantages-of-underground-gate-valve.html\" aria-label=\"Mais em Uma breve introdu\u00e7\u00e3o \u00e0s vantagens da v\u00e1lvula subterr\u00e2nea\">Ler mais<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1928],"tags":[1885,1884],"class_list":["post-17302","post","type-post","status-publish","format-standard","hentry","category-gate-valve","tag-gate-valve-wiki","tag-gate-valve-wikipedia","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":false,"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/pt\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":1928,"name":"Gate Valve","slug":"gate-valve","term_group":0,"term_taxonomy_id":1928,"taxonomy":"category","description":"","parent":0,"count":48,"filter":"raw","cat_ID":1928,"category_count":48,"category_description":"","cat_name":"Gate Valve","category_nicename":"gate-valve","category_parent":0}],"tag_info":[{"term_id":1885,"name":"Gate Valve Wiki","slug":"gate-valve-wiki","term_group":0,"term_taxonomy_id":1885,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_99f55c-5f\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET GATE VALVE WIKI INFORMATION<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-a-gate-valve\">What is a Gate Valve?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened. The gate faces can be parallel but are most commonly wedge-shaped (in order to be able to apply pressure on the sealing surface).\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>How does a Gate Valve work?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA gate valve is a control valve that either allows media to flow through unobstructed or stops the fluid flow. The main advantage of a gate valve is the straight-through unobstructed passageway, which induces minimal pressure loss over the valve. The unobstructed bore of a gate valve also allows for a pig's passage in cleaning pipe procedures, unlike butterfly valves. However, gate valves are slower than quarter-turn valves and should only be used in the fully open or closed position, not to regulate the flow. Automated gate valves exist with either an electric or pneumatic actuator, but a manual gate valve is cost-effective since gate valves are typically used infrequently. Gate valves are also commonly referred to as sluice gate valves.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Where are Gate Valves Used?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nGate valves are often used when minimum pressure loss and a free bore are needed. When fully open, a typical gate valve has no obstruction in the flow path resulting in a very low-pressure loss, and this design makes it possible to use a pipe-cleaning pig. A gate valve is a multiturn valve meaning that the operation of the valve is done by means of a threaded stem. As the valve has to turn multiple times to go from the open to the closed position, the slow operation also prevents water hammer effects.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Advantages of Gate Valves<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>The gate valve is very simple in design, relatively cheap, and easy to maintain.<\/li>\r\n \t<li>There is almost no pressure drop across the valve when the valve is in the fully open position.<\/li>\r\n \t<li>Replacement of the gate valve disc is usually not a difficult task.<\/li>\r\n \t<li>Replacement of the seat rings is usually not a difficult task.<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Disadvantages of Gate Valves<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Gate valves are not well suited to throttling (any valve position between fully open and fully closed) as this creates turbulent flow and frictional losses. A valve left in the almost closed position will cause the flowing medium to flow at a very high velocity across the valve\u2019s seating surfaces, this can lead to damage to the surfaces (\u2018wire-drawing) and passing\/leaking of the valve.<\/li>\r\n \t<li>Gate valves create turbulent flow when throttled and experience excessive vibration as a result. This situation should be avoided to prevent damage from occurring to the valve packing and other internal parts.<\/li>\r\n \t<li>Compared to a globe valve, a gate valve\u2019s seating surfaces are more difficult to refurbish (if seat rings are not used)<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->","parent":0,"count":8,"filter":"raw"},{"term_id":1884,"name":"Gate Valve Wikipedia","slug":"gate-valve-wikipedia","term_group":0,"term_taxonomy_id":1884,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_d2f005-e4\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET GATE VALVE WIKIPEDIA INFORMATION<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-construction-of-gate-valves\">Construction of Gate Valves<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nCommon gate valves are actuated by a threaded stem that connects the actuator (e.g. handwheel or motor) to the gate. They are characterized as having either a rising or a non-rising stem, depending on which end of the stem is threaded. Rising stems are fixed to the gate and rise and lower together as the valve is operated, providing a visual indication of valve position. The actuator is attached to a nut that is rotated around the threaded stem to move it. Non rising stem valves are fixed to, and rotate with, the actuator, and are threaded into the gate. They may have a pointer threaded onto the stem to indicate valve position since the gate's motion is concealed inside the valve. Non rising stems are used where vertical space is limited.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nGate valves can be actuated manually (handwheel) or electrically using a high torque motor.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe sliding gate (disc) can be wedge-shaped (tapered) or parallel-shaped. Wedge shape designs include solid, flexible, and split wedge designs.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSeat rings are used to make the replacement of a worn\/leaking seat easier. Seat rings have a screw thread on the reverse side which can be screwed into the main valve body, the flat surface on the opposite side is the seating surface area that presses against the disc. If seat rings are not used, it is possible to machine a flat seat on the main valve body itself, unfortunately, this makes replacing the seat impossible and the seat can only be machined a few times before the entire valve must be replaced.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nGate valve bonnets are often constructed of cast iron. Cast iron is brittle and this makes the bonnet prone to cracking. Special care should be taken when handling and maintaining valves with cast iron bonnets.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nAs the stem penetrates through the valve bonnet, it is necessary to install a sealing gland to prevent leakage from occurring through the gap between the stem and bonnet; sealing is usually achieved using the fibrous packing material.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFlanges are installed on the suction and discharge side of the valve so that piping can be easily connected.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Gate Valve Types<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe gate comes in various designs and technologies to produce effective sealing for differing applications.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nKnife gate valve\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA knife gate valve is used for thick fluids and dry bulk solids. The gate is only one piece of metal, which is typically pointed like a knife. These valves are self-cleaning as they pass the seat rings every time they open and close.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Wedge Gate Valve<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA wedge gate valve has a gate in the shape of a wedge that sits on two inclined seats. In addition to the primary force created by fluid pressure, a high wedging force on the seats created by the stem tightening assists with the sealing. The wedge-shaped gate does not stick to the seat in case of high fluid differential pressure and has an increased service life due to less \"rubbing\" on the seats. However, wedge-shaped gate valves have an additional compression load on the seats that may result in thermal binding and restricted valve opening due to expansion.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Parallel Slide Gate Valve<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA parallel slide gate valve has a flat gate and seats parallel to it. Parallel slide gate valves use line pressure and positioning to make a tight seal. Flat gates consist of two pieces and have a spring in the middle. The spring pushes the pieces towards the seats for enhanced sealing. Due to their inherent design, parallel gate valves have a safety advantage in higher-temperature applications. Furthermore, since there is no wedging action in parallel gates, closing torques are comparatively smaller, resulting in smaller, less expensive actuators or less manual effort. Due to their sliding into position, parallel gates keep dirt away from the seating surfaces.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Slab Gate Valve<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSlab gates, also called through-conduit gate valves, are one-unit gates that include a bore-size hole. The bore is in line with the two-seat rings in the open state. This alignment creates a smooth flow with minimal turbulence. This unique design allows for minimal pressure loss in the system and is perfect for the transportation of crude oil and natural gas liquids (NGLs). The valve seats remain clean. However, the disc cavity can capture foreign material. Therefore, the cavity typically has a built-in plug for maintenance purposes of draining the accumulated foreign material.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Parallel Expanding Gate Valve<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nExpanding gate valves have two slab gates matched together that provide sealing through the mechanical expansion of the gate, as seen in Figure 5. When lifted, both of the slab gate's cavities allow the media to flow. The upward force on one slab and the stoppage of the second slab, by a step in the valve body, allows for outward mechanical expansion for a proper seal. When closed, the slab gates block the media flow, and the downward force (stem) on one slab and upward force (step in valve body) allows for outward mechanical expansion for a proper seal.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThese valves provide an effective seal simultaneously for both upstream and downstream seats. This seal makes them ideal for applications like isolation valves in power plants, block valves in process systems, and high-temperature valves in refineries.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Metal seated vs Resilient Seated Gate Valves<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nBefore the resilient seated gate valve was introduced to the market, gate valves with a metal seated wedge were widely used. The conical wedge design and angular sealing devices of a metal seated wedge require a depression in the valve bottom to ensure a tight closure. Herewith, sand and pebbles are embedded in the bore. The pipe system will never be completely free from impurities regardless of how thoroughly the pipe is flushed upon installation or repair. Thus, any metal wedge will eventually lose its ability to be drop-tight.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA resilient seated gate valve has a plain valve bottom allowing free passage for sand and pebbles in the valve. If impurities pass as the valve closes, the rubber surface will close around the impurities while the valve is closed. A high-quality rubber compound absorbs the impurities as the valve closes, and the impurities will be flushed away when the valve is opened again. The rubber surface will regain its original shape by securing a drop-tight sealing.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe vast majority of gate valves are resilient seated, however, metal seated gate valves are still requested in some markets, so they are still part of our range for water supply and wastewater treatment.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":8,"filter":"raw"}],"taxonomy_info":{"category":[{"value":1928,"label":"Gate Valve"}],"post_tag":[{"value":1885,"label":"Gate Valve Wiki"},{"value":1884,"label":"Gate Valve Wikipedia"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A Brief Introduction To The Advantages Of Underground Gate Valve - ZECO Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/pt\/a-brief-introduction-to-the-advantages-of-underground-gate-valve.html\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Brief Introduction To The Advantages Of Underground Gate Valve - ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"The underground gate valve has the following advantages: 1.Small flow resistance. The medium passage inside the valve body is straight through, the ... 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